Our mind usually considers the images ‘wonderful, but still’.

We must change our vision considering images as only a fraction of a movie, like in the Shear Waves.

Shear wave propagation in homogeneous isotropic phantom. The 4Z1C/HIFU transducers are located at the top of the volume. The push is focused at 60 mm in the axial direction and at the center of the volume. The shear wave displacement amplitude and the corresponding B-mode image in 3 cross-sectional planes are shown. The coronal plane (shown in red) is orthogonal to the push axis and parallel to the direction of shear wave propagation. The shear wave travels with the same speed in all directions.

SHEAR WAVE PROPAGATION IN THE LIVER

US Elastography MR Elastography

Projection of shear waves in the cirrothic liver

driving frequency: 50 Hzactuator: remote loudspeaker With rod transducersequence: bSSFP-MRE measure time: 16 images in two breat holds of 20 seconds

Projection of shear waves in the healthy liverdriving frequency: 50 Hzactuator: remote loudspeaker with rod transducersequence: bSSFP-MRE measure time: 16 images in two breat holds of 20 seconds

Brain MRE

(a) Shown is an axial MR magnitude image of the brain showing white matter, gray matter and cerebrospinal fluid. (b) A single wave image from MRE performed at 60 Hz. (c) The corresponding elastogram is shown and a good correlation between the magnitude image and the stiffness estimate is evident.

12 Hz 25 Hz 35 Hz 50 Hz 62 Hz